2026 edition · statute-cited · part of Clear Money Guide’s 51-state retirement tax series. This guide covers state taxes on retirement income and estate transfers; property and sales taxes vary by county and are outside its scope.
Updated July 24, 2026. Quick answer: Idaho exempts Social Security and taxes essentially everything else at a flat 5.3% — cut from 5.695% by HB 40 (2025), a figure many guides haven’t caught up with. Pensions, 401(k) and IRA withdrawals get no general exclusion; the state’s Retirement Benefits Deduction (Idaho Code §63-3022A) is far narrower than its name suggests — it covers CSRS but not FERS federal retirees, military retirement, and a short list of Idaho police and firefighter funds, and is reduced by Social Security received. No estate or inheritance tax.
The CSRS-not-FERS trap (and the 2025 changes)
Idaho’s §63-3022A deduction reads like a broad retiree benefit and isn’t: it applies only to Civil Service Retirement System annuities (the pre-1987 federal system — FERS retirees do not qualify), the Foreign Service system, military retirement, the Idaho Firefighters Retirement Fund, and certain Idaho police pensions — and what it grants, it offsets by Social Security benefits received. Two 2025 updates worth dating: HB 40 cut the flat rate to 5.3%, and eligibility expanded so retired servicemembers under 62 can qualify if disabled or employed within income limits. A private-sector retiree gets none of this — every 401(k) dollar is taxed at 5.3%.
How Idaho taxes retirement income (statute-cited)
| Income tax | Flat 5.3% (HB 40, 2025; was 5.695%) |
| Social Security | Not taxed (subtracted in full) |
| Pension / 401(k) / IRA | Fully taxable — no general retirement exclusion |
| CSRS / military / listed plans | Retirement Benefits Deduction (§63-3022A), reduced by SS received; CSRS yes, FERS no |
| Estate / inheritance tax | None |
Probate: reasonable fees and a $100,000 affidavit
Idaho is a UPC state — compensation is “reasonable” (Idaho Code §15-3-719), no percentage schedule. Small estates: up to $100,000 of personal property (net of liens) passes by affidavit (Idaho Code §15-3-1201) after a 30-day wait; summary procedures are also available for a surviving spouse. Context: probate cost by state · small-estate limits by state.
Is Idaho a good state to retire in for taxes?
Middling by design: Social Security rides free, but the flat 5.3% on all withdrawals — with no age-based exclusion — puts Idaho behind neighbors like Wyoming and Nevada (no income tax) and Utah (4.45% with an SS credit) for portfolio retirees, while CSRS and military retirees do meaningfully better. No death taxes and clean UPC probate keep the estate side simple. The 5.3% figure itself is the thing to get right — plenty of coverage still quotes 5.695% or even 5.8%.
Idaho vs. common alternatives
| State | Social Security | Pension / 401(k) / IRA | Estate tax | Inheritance tax |
|---|---|---|---|---|
| Idaho | Not taxed | Fully taxable at flat 5.3% (narrow gov-plan deduction) | None | None |
| Utah | Credit fully offsets tax below $54k/$90k MAGI | Fully taxable at flat 4.45% | None | None |
| Montana | Taxed to the federally taxable extent | Fully taxable; $5,500 subtraction at 65+ | None | None |
| Nevada | Not taxed | Not taxed (no income tax) | None | None |
Comparison rows summarize general rules; see our 51-state retirement tax table for statute-cited detail.
Considering a Roth conversion? The converted amount is taxed as ordinary income in the year you convert, and Idaho may treat it differently from the retirement income above — see how all 51 jurisdictions tax Roth conversions.
Finding a financial advisor in Idaho
Per the SEC’s July 2026 Investment Adviser roster, Idaho has 52 SEC-registered advisory firms (#38 nationally) managing $48.0 billion (#44 by AUM). Full breakdown: Idaho advisor statistics. Reviewing fee structures: fee-drag calculator.
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Thinking about moving?
Four taxes change when you move state in retirement, not one: income tax on withdrawals, state estate tax, state inheritance tax, and what probate costs your heirs. Corridor comparisons involving Idaho:
- California to Idaho retirement taxes
- Colorado to Idaho retirement taxes
- Oregon to Idaho retirement taxes
- Washington to Idaho retirement taxes
Moving to Idaho? See retiring to Idaho.
Compare any two states with the retirement tax comparison tool, or browse all corridors at the relocation hub.
What probate costs in Idaho
Idaho sets probate compensation by a “reasonable fee” standard with no percentage schedule, so anyone quoting a firm figure is estimating. And the small-estate shortcut of $100,000 does not clear a solely owned house on its own, which is the detail most guidance omits. Full detail with the governing statute, the court filing fee and the threshold: Idaho probate cost. To price a specific estate, use the probate cost calculator.
Cite or share this guide
Suggested citation: Clear Money Guide, “Idaho Retirement Taxes (2026 edition),” statute-cited; clearmoneyguide.com/idaho-retirement-taxes/. Free to cite with attribution and a link. Data verified July 23–24, 2026 against state statutes, session laws, and revenue-department guidance.
Primary sources
- https://tax.idaho.gov/taxes/income-tax/individual-income/popular-credits-and-deductions/idaho-retirement-benefits-deduction/
- https://legislature.idaho.gov/statutesrules/idstat/title63/t63ch30/sect63-3022a/
- https://taxfoundation.org/data/all/state/state-income-tax-rates-2026/
- https://taxfoundation.org/data/all/state/estate-inheritance-taxes/
- https://legislature.idaho.gov/statutesrules/idstat/title15/t15ch3/sect15-3-1201/
- https://adacounty.id.gov/clerk/wp-content/uploads/sites/9/2018/10/Affidavit_Collecting_Personal_Property_of_Decedent_Pb_02.pdf